Map.prototype.has()
Baseline Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.
El método has()
de las instancias Map
regresa un booleano indicando si un elemento con la llave especificada existe o no en este map.
Pruébalo
const map1 = new Map();
map1.set("bar", "foo");
console.log(map1.has("bar"));
// Expected output: true
console.log(map1.has("baz"));
// Expected output: false
Sintaxis
js
has(key)
Parámetros
key
-
La llave del elemento que se quiere comprobar si existe en el objeto
Map
.
Valor devuelto
true
si un elemento con la llave especificada existe en el objeto Map
; de lo contrario regresa false
.
Ejemplos
Usando has()
js
const myMap = new Map();
myMap.set("bar", "foo");
console.log(myMap.has("bar")); // true
console.log(myMap.has("baz")); // false
Especificaciones
Specification |
---|
ECMAScript® 2025 Language Specification # sec-map.prototype.has |
Compatibilidad con navegadores
Report problems with this compatibility data on GitHubdesktop | mobile | server | ||||||||||||
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has |
Legend
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- Full support
- Full support
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